[span]到规定压力时不开启：造成这种情况的原因是定压不准。应重新调整弹簧的压缩量或重锤的位置；阀瓣与阀座粘住。应定期对安全阀作手动放气或放水试验；杠杆式安全阀的杠杆被卡住或重锤被移动。应重新调整重锤位置并使杠杆运动自如。[span]
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